Calculate the amount that must be invested at the end of each

year at $9\mathrm{.}7\%$ compounded annually in order to accumulate $$570,000$

after: $($Do not round intermediate calculations and round your final

answers to $2$ decimal places.$)$ a$.25$ years. $ b$.30$ years. $ In each

case, also determine what portion of the $$570,000$ represents

earnings on the annual investments. $($Round your intermediate

calculations and final answers to $2$ decimal places.$)$a$.$ Earnings portion $b$.$ Earnings portion $$$